Ophthalmic lens

Abstract

An ophthalmic lens has a cross-sectional shape in an arbitrary meridian direction on a lens surface of the ophthalmic lens. The cross-sectional shape is expressed by the following formula (1), Z = c  r 2 1 + [ 1 - c 2  r 2  ( k + 1 ) ] 1 / 2 + A  ( θ )  r 2 + B  ( θ )  r 4 . In the formula, c is a paraxial curvature of the ophthalmic lens, r is a distance from a lens center of the ophthalmic lens, k is a conic constant of a surface which is in rotation symmetry with respect to an optical axis of the lens in the ophthalmic lens. The variables c, r and k are used in common in the meridian direction on the lens surface, and A(θ) and B(θ) are parameters expressed by functions depending on an angle in the meridian direction.

Dependencies are inferred from the claim text.